Attachment mechanisms for motor of catheter pump

ABSTRACT

A catheter pump includes an impeller and a drive shaft coupled with the impeller. The catheter pump includes a motor assembly coupled with the drive shaft. The motor assembly includes a motor housing having an opening through a wall of the motor housing and a flexible member disposed about the opening, the flexible member configured to engage a connection portion of a platform.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to U.S. Provisional Patent Application No. 62/106,673, filed on Jan. 22, 2015, the entire contents of which are incorporated by reference herein in their entirety and for all purposes.

BACKGROUND OF THE INVENTION

1. Field of the Invention

This application is directed to catheter pumps for mechanical circulatory support of a heart.

2. Description of the Related Art

Heart disease is a major health problem that has high mortality rate. Physicians increasingly use mechanical circulatory support systems for treating heart failure. The treatment of acute heart failure requires a device that can provide support to the patient quickly. Physicians desire treatment options that can be deployed quickly and minimally-invasively.

Mechanical circulatory support (MCS) systems and ventricular assist devices (VADs) have gained greater acceptance for the treatment of acute heart failure, such as to stabilize a patient after cardiogenic shock, during treatment of acute myocardial infarction (MI) or decompensated heart failure, or to support a patient during high risk percutaneous coronary intervention (PCI). An example of an MCS system is a rotary blood pump placed percutaneously, e.g., via a catheter without a surgical cutdown.

In a conventional approach, a blood pump is inserted into the body and connected to the cardiovascular system, for example, to the left ventricle and the ascending aorta to assist the pumping function of the heart. Other known applications include pumping venous blood from the right ventricle to the pulmonary artery for support of the right side of the heart. Typically, acute circulatory support devices are used to reduce the load on the heart muscle for a period of time, to stabilize the patient prior to heart transplant or for continuing support.

There is a need for improved mechanical circulatory support devices for treating acute heart failure. There is a need for devices designed to provide near full heart flow rate and inserted percutaneously (e.g., through the femoral artery without a cutdown).

There is a need for improved mechanical circulatory support devices for treating acute heart failure. In various aspects, there is the need for a ventricular assist device able to be advanced percutaneously and mounted for a meaningful amount of time. For example, in some cases the pump must remain stably attached at the patient's bed side for hours, and even days. In various respects, there is also the need for a system enabling greater flexibility and a greater variety of configurations. For example, it would be advantageous to provide a system that can be used to treated a patient at the bed side and then easily re-configured for ambulatory care.

There is a need for an attachment mechanism that can be used to effectively and removably attach a motor assembly of the catheter pump to a fixture and/or to the patient.

These and other problems are overcome by the inventions described herein.

SUMMARY OF THE INVENTION

There is an urgent need for a pumping device that can be inserted percutaneously and also provide full cardiac rate flows of the left, right, or both the left and right sides of the heart when called for.

In one embodiment, a catheter pump is disclosed. The catheter pump can include an impeller and a drive shaft coupled with the impeller. The catheter pump can include a motor assembly coupled with the drive shaft. The motor assembly can include a motor housing having an opening through a wall of the motor housing and a flexible member disposed about the opening. The flexible member can be configured to engage a connection portion of a platform.

In another embodiment, a kit for a catheter pump is disclosed. The kit can include an impeller and a drive shaft coupled with the impeller. The kit can include a motor assembly coupled with the drive shaft, the motor assembly comprising a connector. A first platform can be mounted to a patient or a structure to support the motor assembly, the first platform configured to attach to the motor assembly by way of the connector. A second platform can be mounted to the patient or the structure to support the motor assembly, the second platform configured to attach to the motor assembly by way of the connector.

In another embodiment, a medical device housing is disclosed. The medical device housing can include a housing enclosing the contents of an external medical device. The medical device housing can include a coupling mechanism disposed on the housing. The coupling mechanism can be configured to couple to a corresponding connection piece on a first support structure and a common connection piece on a second support structure.

In yet another embodiment, a catheter pump is disclosed. The catheter pump can include an impeller and a drive shaft coupled with the impeller. The catheter pump can include a motor assembly coupled with the drive shaft, the motor assembly comprising a motor housing having a first connector portion. The catheter pump can include a mount platform having a second connector portion. One of the first and second connector portions can comprise an opening having a flexible member disposed therein, the other of the first and second connector portions being insertable into the opening to compress the flexible member within the opening to secure the first and second connector portions together.

BRIEF DESCRIPTION OF THE DRAWINGS

A more complete appreciation of the subject matter of this application and the various advantages thereof can be realized by reference to the following detailed description, in which reference is made to the accompanying drawings in which:

FIG. 1A illustrates one embodiment of a catheter pump with an impeller assembly configured for percutaneous application and operation.

FIG. 1B is a schematic view of one embodiment of a catheter pump system adapted to be used in the manner illustrated in FIG. 1A.

FIG. 1C is a schematic view of another embodiment of a catheter pump system.

FIG. 2 is a schematic perspective view of a platform that can be used to support a motor assembly.

FIG. 3 is a schematic perspective view a platform that can be used to support a motor assembly.

More detailed descriptions of various embodiments of components for heart pumps useful to treat patients experiencing cardiac stress, including acute heart failure, are set forth below.

DETAILED DESCRIPTION

This application is generally directed to apparatuses for inducing motion of a fluid relative to the apparatus. Exemplars of circulatory support systems for treating heart failure, and in particular emergent and/or acute heart failure, are disclosed in U.S. Pat. Nos. 4,625,712; 4,686,982; 4,747,406; 4,895,557; 4,944,722; 6,176,848; 6,926,662; 7,022,100; 7,393,181; 7,841,976; 8,157,719; 8,489,190; 8,597,170; 8,721,517 and U.S. Pub. Nos. 2012/0178986 and 2014/0010686, the entire contents of which patents and publications are incorporated by reference for all purposes. In addition, this application incorporates by reference in its entirety and for all purposes the subject matter disclosed in each of the following concurrently filed applications and the provisional applications to which they claim priority: application Ser. No. ______, which corresponds to attorney docket no. THOR.127A, entitled “REDUCED ROTATIONAL MASS MOTOR ASSEMBLY FOR CATHETER PUMP,” filed on the same date as this application and claiming priority to U.S. Provisional Patent Application No. 62/106,670; and application Ser. No. ______, which corresponds to attorney docket no. THOR.128A, entitled “MOTOR ASSEMBLY WITH HEAT EXCHANGER FOR CATHETER PUMP,” filed on the same date as this application and claiming priority to U.S. Provisional Patent Application No. 62/106,675.

In one example, an impeller can be coupled at a distal portion of the apparatus. Some embodiments generally relate to various configurations for a motor assembly adapted to drive an impeller at a distal end of a catheter pump. In such applications, the disclosed motor assembly is disposed outside the patient in some embodiments. In other embodiments, the disclosed motor assembly and/or features of the motor are miniaturized and sized to be inserted within the body, e.g., within the vasculature.

FIGS. 1A-1B show aspects of an exemplary catheter pump 100A that can provide high performance, e.g., high blood flow rates. As shown in FIG. 1B, the pump 100A includes a motor assembly 1 driven by a console 122, which can include an electronic controller and various fluid handling systems. The console 122 directs the operation of the motor 1 and an infusion system that supplies a flow of fluid in the pump 100A. Additional details regarding the console 122 may be found throughout U.S. Patent Publication No. US 2014/0275725, the contents of which are incorporated by reference herein in their entirety and for all purposes.

The pump 100A includes a catheter assembly that can be coupled with the motor assembly 1 and can house an impeller in an impeller assembly 116A within a distal portion of the catheter assembly of the pump 100A. In various embodiments, the impeller is rotated remotely by the motor 1 when the pump 100A is operating. For example, the motor 1 can be disposed outside the patient. In some embodiments, the motor 1 is separate from the console 122, e.g., to be placed closer to the patient. In the exemplary system the pump is placed in the patient in a sterile environment and the console is outside the sterile environment. In one embodiment, the motor is disposed on the sterile side of the system. In other embodiments, the motor 1 is part of the console 122.

In still other embodiments, the motor is miniaturized to be insertable into the patient. For example, FIG. 1C is a schematic view of another embodiment of a catheter pump system. FIG. 1C is similar to FIG. 1B, except the motor 1 is miniaturized for insertion into the body. As shown in FIG. 1C, for example, the motor 1 can be disposed proximal the impeller assembly 116A. The motor 1 can be generally similar to the motor assembly shown in FIG. 2, except the motor 1 is sized and shaped to be inserted into the patient's vasculature. One or more electrical lines can extend from the motor 1 to the console to control operation of the motor 1. Such embodiments allow a drive shaft coupled with the impeller and disposed within the catheter assembly to be much shorter, e.g., shorter than the distance from the aortic valve to the aortic arch (about 5 cm or less). Some examples of miniaturized motor catheter pumps and related components and methods are discussed in U.S. Pat. No. 5,964,694; U.S. Pat. No. 6,007,478; U.S. Pat. No. 6,178,922; and U.S. Pat. No. 6,176,848, all of which are hereby incorporated by reference herein in their entirety for all purposes. Various embodiments of the motor assembly 1 are disclosed herein, including embodiments having a rotor disposed within a stator assembly. In various embodiments, waste fluid can pass through a housing 4 in which the rotor is disposed to help cool the motor assembly 1.

FIG. 1A illustrates one use of the catheter pump 100A. A distal portion of the pump 100A including a catheter assembly including the impeller assembly 116A is placed in the left ventricle LV of the heart to pump blood from the LV into the aorta. The pump 100A can be used in this way to treat a wide range of heart failure patient populations including, but not limited to, cardiogenic shock (such as acute myocardial infarction, acute decompensated heart failure, and postcardiotomy), myocarditis, and others. The pump can also be used for various other indications including to support a patient during a cardiac invention such as as a high-risk percutaneous coronary intervention (PCI) or VF ablation. One convenient manner of placement of the distal portion of the pump 100A in the heart is by percutaneous access and delivery using a modified Seldinger technique or other methods familiar to cardiologists. These approaches enable the pump 100A to be used in emergency medicine, a catheter lab and in other medical settings. Modifications can also enable the pump 100A to support the right side of the heart. Example modifications that could be used for right side support include providing delivery features and/or shaping a distal portion that is to be placed through at least one heart valve from the venous side, such as is discussed in U.S. Pat. No. 6,544,216; U.S. Pat. No. 7,070,555; and US 2012-0203056A1, all of which are hereby incorporated by reference herein in their entirety for all purposes.

The impeller assembly 116A can be expandable and collapsible. In the collapsed state, the distal end of the catheter pump 100A can be advanced to the heart, for example, through an artery. In the expanded state the impeller assembly 116A is able to pump blood at relatively high flow rates. In particular, the expandable cannula and impeller configuration allows for decoupling of the insertion size and flow rate, in other words, it allows for higher flow rates than would be possible through a lumen limited to the insertion size with all other things being equal. In FIGS. 1A and 1B, the impeller assembly 116A is illustrated in the expanded state. The collapsed state can be provided by advancing a distal end 170A of an elongate body 174A distally over the impeller assembly 116A to cause the impeller assembly 116A to collapse. This provides an outer profile throughout the catheter assembly and catheter pump 100A that is of small diameter during insertion, for example, to a catheter size of about 12.5 FR in various arrangements. In other embodiments, the impeller assembly 116A is not expandable.

The mechanical components rotatably supporting the impeller within the impeller assembly 116A permit relatively high rotational speeds while controlling heat and particle generation that can come with high speeds. The infusion system delivers a cooling and lubricating solution to the distal portion of the catheter pump 100A for these purposes. The space for delivery of this fluid is extremely limited. Some of the space is also used for return of the supply fluid as waste fluid. Providing secure connection and reliable routing of fluid into and out of the catheter pump 100A is critical and challenging in view of the small profile of the catheter assembly.

When activated, the catheter pump 100A can effectively support, restore and/or increase the flow of blood out of the heart and through the patient's vascular system. In various embodiments disclosed herein, the pump 100A can be configured to produce a maximum flow rate (e.g. low mm Hg) of greater than 4 Lpm, greater than 4.5 Lpm, greater than 5 Lpm, greater than 5.5 Lpm, greater than 6 Lpm, greater than 6.5 Lpm, greater than 7 Lpm, greater than 7.5 Lpm, greater than 8 Lpm, greater than 9 Lpm, or greater than 10 Lpm. In various embodiments, the pump 100A can be configured to produce an average flow rate at 62 mmHg of greater than 2 Lpm, greater than 2.5 Lpm, greater than 3 Lpm, greater than 3.5 Lpm, greater than 4 Lpm, greater than 4.25 Lpm, greater than 4.5 Lpm, greater than 5 Lpm, greater than 5.5 Lpm, or greater than 6 Lpm.

Various aspects of the pump and associated components can be combined with or substituted for those disclosed in U.S. Pat. Nos. 7,393,181; 8,376,707; 7,841,976; 7,022,100; and 7,998,054, and in U.S. Pub. Nos. 2011/0004046; 2012/0178986; 2012/0172655; 2012/0178985; and 2012/0004495, the entire contents of each of which are incorporated herein for all purposes by reference. In addition, this application incorporates by reference in its entirety and for all purposes the subject matter disclosed in each of the following applications: U.S. Patent Publication No. US 2013/0303970, entitled “DISTAL BEARING SUPPORT,” filed on Mar. 13, 2013; U.S. Patent Publication No. US 2014/0275725, entitled “FLUID HANDLING SYSTEM,” filed on Mar. 11, 2014; U.S. Patent Publication No. US 2013/0303969, entitled “SHEATH SYSTEM FOR CATHETER PUMP,” filed on Mar. 13, 2013; U.S. Patent Publication No. US 2013/0303830, entitled “IMPELLER FOR CATHETER PUMP,” filed on Mar. 13, 2013; U.S. Patent Publication No. US 2014/0012065, entitled “CATHETER PUMP,” filed on Mar. 13, 2013; and U.S. Patent Publication No. US 2014/0010686, entitled “MOTOR ASSEMBLY FOR CATHETER PUMP,” filed on Mar. 13, 2013.

Moving from a distal end 1450 of the catheter assembly of the catheter pump 100A of FIG. 1B to a proximal end 1455, a priming apparatus 1400 can be disposed over the impeller assembly 116A. As explained above, the impeller assembly 116A can include an expandable cannula or housing and an impeller with one or more blades. As the impeller rotates, blood can be pumped proximally (or distally in some implementations) to function as a cardiac assist device.

In FIG. 1B the priming apparatus 1400 can be disposed over the impeller assembly 116A near the distal end portion 170A of the elongate body 174A. The priming apparatus 1400 can be used in connection with a procedure to expel air from the impeller assembly 116A, e.g., any air that is trapped within the housing or that remains within the elongate body 174A near the distal end 170A. For example, the priming procedure may be performed before the pump is inserted into the patient's vascular system, so that air bubbles are not allowed to enter and/or injure the patient. The priming apparatus 1400 can include a primer housing 1401 configured to be disposed around both the elongate body 174A and the impeller assembly 116A. A sealing cap 1406 can be applied to the proximal end 1402 of the primer housing 1401 to substantially seal the priming apparatus 1400 for priming, i.e., so that air does not proximally enter the elongate body 174A and also so that priming fluid does not flow out of the proximal end of the housing 1401. The sealing cap 1406 can couple to the primer housing 1401 in any way known to a skilled artisan. In some embodiments, the sealing cap 1406 is threaded onto the primer housing by way of a threaded connector 1405 located at the proximal end 1402 of the primer housing 1401. The sealing cap 1406 can include a sealing recess disposed at the distal end of the sealing cap 1406. The sealing recess can be configured to allow the elongate body 174A to pass through the sealing cap 1406.

The priming operation can proceed by introducing fluid into the sealed priming apparatus 1400 to expel air from the impeller assembly 116A and the elongate body 174A. Fluid can be introduced into the priming apparatus 1400 in a variety of ways. For example, fluid can be introduced distally through the elongate body 174A into the priming apparatus 1400. In other embodiments, an inlet, such as a luer, can optionally be formed on a side of the primer housing 1401 to allow for introduction of fluid into the priming apparatus 1400. A gas permeable membrane can be disposed on a distal end 1404 of the primer housing 1401. The gas permeable membrane can permit air to escape from the primer housing 1401 during priming.

The priming apparatus 1400 also can advantageously be configured to collapse an expandable portion of the catheter pump 100A. The primer housing 1401 can include a funnel 1415 where the inner diameter of the housing decreases from distal to proximal. The funnel may be gently curved such that relative proximal movement of the impeller housing causes the impeller housing to be collapsed by the funnel 1415. During or after the impeller housing has been fully collapsed, the distal end 170A of the elongate body 174A can be moved distally relative to the collapsed housing. After the impeller housing is fully collapsed and retracted into the elongate body 174A of the sheath assembly, the catheter pump 100A can be removed from the priming housing 1400 before a percutaneous heart procedure is performed, e.g., before the pump 100A is activated to pump blood. The embodiments disclosed herein may be implemented such that the total time for infusing the system is minimized or reduced. For example, in some implementations, the time to fully infuse the system can be about six minutes or less. In other implementations, the time to infuse can be about three minutes or less. In yet other implementations, the total time to infuse the system can be about 45 seconds or less. It should be appreciated that lower times to infuse can be advantageous for use with cardiovascular patients.

With continued reference to FIG. 1B, the elongate body 174A extends from the impeller assembly 116A in a proximal direction to a fluid supply device 195. The fluid supply device 195 is configured to allow for fluid to enter the catheter assembly 100A and/or for waste fluid to leave the catheter assembly 100A. A catheter body 120A (which also passes through the elongate body 174A) can extend proximally and couple to the motor assembly 1. As discussed in more detail herein, the motor assembly 1 can provide torque to a drive shaft that extends from the motor assembly 1 through the catheter body 120A to couple to an impeller shaft at or proximal to the impeller assembly 116A. The catheter body 120A can pass within the elongate body 174A such that the external elongate body 174A can axially translate relative to the internal catheter body 120A.

Further, as shown in FIG. 1B, a fluid supply line 6 can fluidly couple with the console 122 to supply saline or other fluid to the catheter pump 100A. The saline or other fluid can pass through an internal lumen of the internal catheter body 120A and can provide lubrication to the impeller assembly 116A and/or chemicals to the patient. The supplied fluid (e.g., saline or glucose solution) can be supplied to the patient by way of the catheter body 120 at any suitable flow rate. For example, in various embodiments, the fluid is supplied to the patient at a flow rate in a range of 15 mL/hr to 50 mL/hr, or more particularly, in a range of 20 mL/hr to 40 mL/hr, or more particularly, in a range of 25 mL/hr to 35 mL/hr. One or more electrical conduits 124 can provide electrical communication between the console 122 and the motor assembly 1. A controller within the console 122 can control the operation of the motor assembly 1 during use. In addition, a waste line 7 can extend from the motor assembly 1 to a waste reservoir 126. Waste fluid from the catheter pump 100A can pass through the motor assembly 1 and out to the reservoir 126 by way of the waste line 7.

Access can be provided to a proximal end of the catheter assembly of the catheter pump 100A prior to or during use. In one configuration, the catheter assembly 101 is delivered over a guidewire 235. The guidewire 235 may be conveniently extended through the entire length of the catheter assembly 101 of the catheter pump 100A and out of a proximal end 1455 of the catheter assembly 101. In various embodiments, the connection between the motor assembly 1 and the catheter assembly 101 is configured to be permanent, such that the catheter pump, the motor housing and the motor are disposable components. However, in other implementations, the coupling between the motor housing and the catheter assembly is disengageable, such that the motor and motor housing can be decoupled from the catheter assembly after use. In such embodiments, the catheter assembly distal of the motor can be disposable, and the motor and motor housing can be re-usable.

In addition, FIG. 1B illustrates the guidewire 235 extending from a proximal guidewire opening 237 in the motor assembly 1. Before inserting the catheter assembly 101 of the catheter pump 100A into a patient, a clinician may insert the guidewire 235 through the patient's vascular system to the heart to prepare a path for the impeller assembly 116A to the heart. In some embodiments, the catheter pump 100A can include a guidewire guide tube 20 (see FIG. 3) passing through a central internal lumen of the catheter pump 100A from the proximal guidewire opening 237. The guidewire guide tube 20 can be pre-installed in the catheter pump 100A to provide the clinician with a preformed pathway along which to insert the guidewire 235.

In one approach, the guidewire 235 is first placed through a needle into a peripheral blood vessel, and along the path between that blood vessel and the heart and into a heart chamber, e.g., into the left ventricle. Thereafter, a distal end opening of the catheter pump 100A and guidewire guide tube 20 can be advanced over the proximal end of the guidewire 235 to enable delivery to the catheter pump 100A. After the proximal end of the guidewire 235 is urged proximally within the catheter pump 100A and emerges from the guidewire opening 237 and/or guidewire guide tube 20, the catheter pump 100A can be advanced into the patient. In one method, the guidewire guide tube 20 is withdrawn proximally while holding the catheter pump 100A.

Alternatively, the clinician can thus insert the guidewire 235 through the proximal guidewire opening 237 and urge the guidewire 235 along the guidewire guide tube. The clinician can continue urging the guidewire 235 through the patient's vascular system until the distal end of the guidewire 235 is positioned in the desired position, e.g., in a chamber of the patient's heart, a major blood vessel or other source of blood. As shown in FIG. 1B, a proximal end portion of the guidewire 235 can extend from the proximal guidewire opening 237. Once the distal end of the guidewire 235 is positioned in the heart, the clinician can maneuver the impeller assembly 116A over the guidewire 235 until the impeller assembly 116A reaches the distal end of the guidewire 235 in the heart, blood vessel or other source of blood. The clinician can remove the guidewire 235 and the guidewire guide tube. The guidewire guide tube can also be removed before or after the guidewire 235 is removed in some implementations.

After removing at least the guidewire 235, the clinician can activate the motor 1 to rotate the impeller and begin operation of the pump 100A.

The distance between the motor assembly 1 shown in FIG. 1B and the insertion site in the patient's body may be relatively short such that the motor assembly 1 is positioned relatively close to the insertion site, e.g., the site in the patient's body at which the catheter pump 100A is inserted into the patient. It can be important to stably and securely fasten the motor assembly 1 to different types of platforms in the treatment room. For example, in one arrangement, the motor assembly 1 can be attached to a band that is secured to the patient, e.g., secured about the patient's leg, arm, etc, and/or to an IV pole. In other arrangements, the motor assembly 1 can be attached to an articulating clamp so as to adjustably position the motor assembly 1. Still other types of platforms may be used to support the motor assembly 1. For example, a table or other support structure can be provided to support the motor assembly. Advantageously, the embodiments disclosed herein can utilize a common connector on the motor assembly 1 so that the motor assembly 1 can connect to different kinds of platforms and support various configurations.

FIG. 2 is a schematic perspective view of an exemplary platform 50 that can be used to support the motor assembly 1. In particular, the platform 50 shown in FIG. 2 can be secured to a portion of the patient's body during treatment. For example, the platform 50 can comprise a band 51 having an aperture 52 therethrough. The band 51 and aperture 52 can be sized and shaped to be disposed about the portion of the patient's body, e.g., about an arm or leg of the patient. In other embodiments, the band 51 and aperture 52 can be sized and shaped to be secured to an IV pole, hospital bed, or other structure in the treatment room. In some cases it may be beneficial to mount the motor assembly on or close to the patient to reduce the interventional length. In some cases it may be beneficial to mount the motor assembly remotely from the patient. For example, typically catheter pumps rotate at high speeds and thus transmit significant noise, vibrations, and emit. Over time the pump components (e.g. driveshaft and motor) can be uncomfortable, annoying, and even risk injury if placed directly on the patient's skin.

Exemplary connector 55 can include a platform connection portion 53 coupled with the platform 50 and a motor connection portion 54 mechanically coupled or formed with the motor assembly 1. For example, in the illustrated embodiment, the motor assembly 1 can comprise a motor housing 40 about the exterior of the assembly 1. The motor connection portion 54 can comprise an opening in the motor housing and a flexible member 57 disposed about the opening. To secure the motor assembly 1 to the platform 50, the user can insert the platform connection portion 53 inside the opening, which can cause the flexible member 57 to compress. Further insertion of the platform connection portion 53 (which can comprise a projection) into the opening can cause the flexible member 57 to expand radially inward into a groove 56 of the platform connection portion 53. For example, an inner diameter of the flexible member 57 can be smaller than an outer diameter of the platform connection portion 53. The platform connection portion 53 can be contoured such that a top region of the connection portion 53 is larger than the flexible member 57. Engagement of the flexible member 57 with the groove 56 can help secure the motor assembly 1 to the platform 50. The motor assembly 1 can be removed from the platform by pulling the platform connection portion 53 out of the opening. Thus, the connector 55 provides a secure connection between the motor assembly 1 and the platform 50. The connector 55 can prevent the catheter pump 100A from being pulled out of the patient, e.g., the connector can longitudinally secure the catheter pump 100A relative to the platform 50.

FIG. 3 is a schematic perspective view of a platform 50A that can be used to support the motor assembly 1. As explained above, the connector 55 can removably secure the motor assembly 1 to the platform 50A. In an exemplary embodiment, connector 55 shown in FIG. 3 is the same as the connector 55 shown in FIG. 2. The use of a common connector 55 can advantageously enable the user to mount the motor assembly 1 to different types of platforms such as elements 50 and 50A. For example, in the embodiment of FIG. 3, the platform 50A is an articulating clamp that can support the motor housing 1. The articulating clamp can include a proximal adapter 58 configured to attach to a structure in the treatment room, such as an IV pole, a bed, a table, or any other suitable structure. The articulating clamp can also include a distal adapter 59 that includes, or is coupled with, the platform connection portion 53. Thus, the user can mount the platform 50A (e.g., the articulating clamp) to a structure in the treatment room and can attach the motor housing 1 to the distal adapter 59 by way of the common connector 55. The user can manipulate the articulating clamp to position the motor assembly 1 at a desired position and orientation. Furthermore, by attaching the motor assembly 1 to the articulating clamp, rather than to the patient's body, the embodiment of FIG. 3 can advantageously reduce the transmission of vibrations and/or heat from the motor assembly 1 to the patient.

In various embodiments, the motor assembly includes a motor housing comprising a latching mechanism configured to pivotably mount to a mounting structure. Referring to FIG. 3, by example, connection portion 54 allows for the motor housing 40 to rotate relative to the platform connection portion 53. In various embodiments, the connection portions are configured to allow the motor housing to freely rotate. In various embodiments, the connection portions are configured to allow the motor housing to rotate at predetermined increments. The latching mechanism may also be designed to lock the motor housing at a desired rotational angle. For example, a clamping mechanism may be provided around the connection members to squeeze and lock the rotational angle. The system may include a coupling mechanism to allow the motor to translate and/or rotate in all degrees of freedom as will be appreciated from the description herein.

The coupling mechanism for mounting the motor housing to the support structure (e.g. leg strap or IV pole) may vary by application. In various embodiments, the coupling mechanism may be made with a canted coil spring in place of flexible member 57. For example, in some embodiments, the motor housing can be mounted to the support structure using a coupling mechanism which incorporates a canted coiled spring. An example of a suitable spring is a canted coil spring manufactured by Bal Seal Engineering, Inc., of Foothill Ranch, California. Other examples of various releasable locking springs are disclosed in U.S. Pat. Nos. 8,753,153; 5,141,448; and 4,974,821 and U.S. Pub. No. 2008/0220672, the entire contents of which are incorporated herein for all purposes by reference.

In an exemplary embodiment the platform connection portion 53 is removably attached to a leg strap. This allows the connection portion to be replaced without removing and discarding the whole leg strap from the patient. In various embodiments, a variety of connection portions are provided, each configured for different functions. For example, one connection portion can enable free rotation of the motor housing and another connection may be configured to fix the housing at a predetermined angle.

In various embodiments, the housing 40 is configured to be removable. For example, the housing may be provided in a clamshell design with a latch so it can be opened and removed. In one example, a separate sleeve is provided around housing 40, the sleeve including a connection portion for mounting. The housing and/or sleeve may be substantially waterproof. Examples of a waterproof and/or protective housing are disclosed in U.S. Pat. Nos. 7,801,425 and 5,412,272, the entire contents of which are incorporated herein for all purposes by reference. In various embodiments, the housing and/or sleeve meets at least level 04 of the IP testing standard for water ingress. In some embodiments, a coupling mechanism is disposed on the housing. The coupling mechanism can be configured to couple to a corresponding connection piece on a first support structure and a common connection piece on a second support structure, as explained in connection with the embodiments of FIGS. 2-3. In some embodiments, the housing can comprise a first segment and at least a second segment joined to the first segment by a hinge. A latch can be provided for securing the first segment to the at least second segment thereby enclosing the contents of the housing.

Although the embodiments disclosed herein disclose an articulating clamp and a band as options for the platform, it should be appreciated that any other suitable platform may be used in combination with the disclosed embodiments. For example, the connector 55 can be used to secure the motor assembly 1 to an IV pole, bed, etc. Indeed, in some embodiments, a kit can be provided that includes one or more platforms that can be secured to the motor assembly by way of the common connector 55. Moreover, it should be appreciated that any suitable type of connector 55 may be used to attach the motor assembly 1 to the platform, so long as each platform to be used can mate with the motor assembly 1.

Although the embodiments disclosed herein have been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present inventions. It is therefore to be understood that numerous modifications can be made to the illustrative embodiments and that other arrangements can be devised without departing from the spirit and scope of the present inventions as defined by the appended claims. Thus, it is intended that the present application cover the modifications and variations of these embodiments and their equivalents. 

What is claimed is:
 1. A catheter pump system comprising: an impeller; a drive shaft coupled with the impeller; and a motor assembly coupled with the drive shaft, the motor assembly comprising a motor housing having an opening through a wall of the motor housing and a flexible member disposed about the opening, the flexible member configured to engage a connection portion of a platform.
 2. The catheter pump system of claim 1, further comprising the platform.
 3. The catheter pump system of claim 2, wherein the platform includes a clamp or a band sized and shaped to be disposed about a portion of a patient.
 4. The catheter pump system of claim 1, wherein the connection portion of the platform comprises a projection having a groove formed about a perimeter of the projection, wherein the motor assembly is secured to the platform by inserting the projection into the opening such that the flexible member is captured in the groove.
 5. A kit for a catheter pump system comprising: an impeller; a drive shaft coupled with the impeller; a motor assembly coupled with the drive shaft, the motor assembly comprising a connector; a first platform to be mounted to a patient or a structure to support the motor assembly, the first platform configured to attach to the motor assembly by way of the connector; and a second platform to be mounted to the patient or the structure to support the motor assembly, the second platform configured to attach to the motor assembly by way of the connector.
 6. The kit of claim 5, wherein the first platform comprises a band or a clamp.
 7. A medical device housing, comprising: a housing enclosing the contents of an external medical device; a coupling mechanism disposed on the housing; wherein the coupling mechanism is configured to couple to a corresponding connection piece on a first support structure and a common connection piece on a second support structure.
 8. The medical device of claim 7, wherein the housing further comprises: a first segment; at least a second segment joined to the first segment by a hinge; and a latch for securing the first segment to the at least second segment thereby enclosing the contents of the housing.
 9. The medical device of claim 8, wherein one of the coupling mechanism and the connection piece comprises a protrusion projecting from the housing surface and forming a radial groove, and the other comprises a spring lock mechanism for locking into the groove.
 10. The medical device of claim 7, wherein the housing is substantially water resistant.
 11. The medical device of claim 7, wherein the coupling mechanism comprises a housing connector for cooperating with the respective connection piece.
 12. The medical device of claim 11, wherein the coupling mechanism comprises a canted spring locking mechanism.
 13. The medical device of claim 11, further comprising a locking mechanism for locking the coupling mechanism after the coupling mechanism cooperates with the respective connection piece.
 14. A catheter pump system comprising: an impeller; a drive shaft coupled with the impeller; a motor assembly coupled with the drive shaft, the motor assembly comprising a motor housing having a first connector portion; and a mount platform having a second connector portion; wherein one of the first and second connector portions comprises an opening having a flexible member disposed therein, the other of the first and second connector portions being insertable into the opening to compress the flexible member within the opening to secure the first and second connector portions together.
 15. The catheter pump system of claim 14, wherein the other of the first and second connector portions comprises a projection, the projection wider than the opening.
 16. The catheter pump system of claim 14, wherein the mount platform comprises an articulating arm.
 17. The catheter pump system of claim 14, wherein the mount platform comprises a band configured to be disposed about an arm or a leg of a patient.
 18. The catheter pump system of claim 14, wherein the first connector portion comprises the opening having the flexible member and the second connector portion comprises a projection insertable into the opening. 